package designpattern.singleton.base;

/**
 * 单例。
 * 
 * @author chunwei.zhao
 * 
 */
public class Singleton {
	private volatile static Singleton instance;

	public static Singleton getInstance() {
		if (instance == null) {
			synchronized (Singleton.class) {
				if (instance == null) {
					instance = new Singleton();
				}
			}
		}
		
		return instance;
	}

	private Singleton() {
	}
}
